Update eleventy config so watching drafts works again

.eleventy.js

@@ -13,14 +13,17 @@ const { DateTime } = require('luxon')
 const header = require('./src/_includes/filters/header')
 
 module.exports = function (config) {
+  config.addWatchTarget('./src/posts/drafts/*.md')
+  config.setServerOptions({
+    watch: [
+      './_site/assets/*.css'
+    ]
+  })
+
   config.addPlugin(pluginRss)
   config.addPlugin(pluginToc)
   config.addPlugin(pluginSyntaxHighlight)
 
-  config.setBrowserSyncConfig({
-    files: './_site/assets/*.css'
-  })
-
   config.addPassthroughCopy('src/assets/key.txt')
   config.addPassthroughCopy('src/assets/prism-base16-ateliersulphurpool.light.css')
   config.addPassthroughCopy('src/posts/**/*.{jpeg,jpg,png,webp}')